99 Cobra IRS rearend questions:

Joined
Jul 1, 2008
Messages
135
Reaction score
4
Hey everyone I am going to be putting in a T56 tranny and I am going to be upgrading the rearend for the power I will be putting the ground. I will be hopefully putting 600-700 rwhp and I am going to upgrade the axles to 31 spline and was wondering if I need to upgrade the differential also with a 31 spline since I think the T56 tranny has the 31 spline shaft. Any help would be greatly appreciated.
 

RichV

Well-Known Member
Joined
May 6, 2012
Messages
4,230
Reaction score
250
Location
CO
The tranny has nothing to do with the dif splines. If you get 31 spline axles, you need a 31 spline diff.
 

Win

Legend
Joined
Nov 20, 2006
Messages
9,514
Reaction score
8
Location
Kennesaw, Ga
Hey everyone I am going to be putting in a T56 tranny and I am going to be upgrading the rearend for the power I will be putting the ground. I will be hopefully putting 600-700 rwhp and I am going to upgrade the axles to 31 spline and was wondering if I need to upgrade the differential also with a 31 spline since I think the T56 tranny has the 31 spline shaft. Any help would be greatly appreciated.


Dont get a 99 they have full 28 spline. Get a 03/04 they have the 31 spline and the torque brace already on there. the cost of doing all the upgrades you would be better off starting with a 03/04. Then no upgrades are needed besides bushings. Unless you plan on going crazy with the FTBR kits.

You will have to upgrade the diff to accept the new 31 spline axles. A lot of guys that have 01's will upgrade to the 03/04 axles bc they will handle more power and be gotten for cheap.
 
OP
OP
C
Joined
Jul 1, 2008
Messages
135
Reaction score
4
I already have the 99 cobra I am going to be rebuilding it from the ground up pretty much like Deeplist is doing with the white cobra he bought.
 

Win

Legend
Joined
Nov 20, 2006
Messages
9,514
Reaction score
8
Location
Kennesaw, Ga
I already have the 99 cobra I am going to be rebuilding it from the ground up pretty much like Deeplist is doing with the white cobra he bought.


Okie dokie

well you need a new diff to upgrade to 31 spline. THe problem with the 99's is he cv axles taper down and that's there weak point along with the 28 spline. The 03/04 are a constant diameter.
 

Latest posts

Forum statistics

Threads
75,625
Messages
1,463,329
Members
13,878
Latest member
All Da Beanz Racing

Members online

Top